diff --git a/guides/source/action_controller_overview.md b/guides/source/action_controller_overview.md
index e0e85588a0..4e3319dec4 100644
--- a/guides/source/action_controller_overview.md
+++ b/guides/source/action_controller_overview.md
@@ -457,7 +457,9 @@ class LoginsController < ApplicationController
   # "Delete" a login, aka "log the user out"
   def destroy
     # Remove the user id from the session
-    @_current_user = session[:current_user_id] = nil
+    session.delete(:current_user_id)
+    # Clear the memoized current user
+    @_current_user = nil
     redirect_to root_url
   end
 end